{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:RY2F3KLBBJQHMERAQX3RYQO6LJ","short_pith_number":"pith:RY2F3KLB","canonical_record":{"source":{"id":"1008.1584","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-09T20:03:53Z","cross_cats_sorted":[],"title_canon_sha256":"07d33c450484972e98825921ffe4048b3ccaf59c7e3aa3d330539b967a372b57","abstract_canon_sha256":"6e88540af94583377694ebdb84fbbe95d487530c19abb86024ef5388d370ba73"},"schema_version":"1.0"},"canonical_sha256":"8e345da9610a6076122085f71c41de5a711ed18679360d6b5972a47e6ee95371","source":{"kind":"arxiv","id":"1008.1584","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.1584","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"arxiv_version","alias_value":"1008.1584v1","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.1584","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"pith_short_12","alias_value":"RY2F3KLBBJQH","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"RY2F3KLBBJQHMERA","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"RY2F3KLB","created_at":"2026-05-18T12:26:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:RY2F3KLBBJQHMERAQX3RYQO6LJ","target":"record","payload":{"canonical_record":{"source":{"id":"1008.1584","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-09T20:03:53Z","cross_cats_sorted":[],"title_canon_sha256":"07d33c450484972e98825921ffe4048b3ccaf59c7e3aa3d330539b967a372b57","abstract_canon_sha256":"6e88540af94583377694ebdb84fbbe95d487530c19abb86024ef5388d370ba73"},"schema_version":"1.0"},"canonical_sha256":"8e345da9610a6076122085f71c41de5a711ed18679360d6b5972a47e6ee95371","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:50.050585Z","signature_b64":"PUcsGGDhFWwq1Vl8i2vBMCoeeW6FIj3wChieZw+llVcDcI5xvWAzIPOqW3k/VRr693Coi/EgzG4beCBLdsw4BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8e345da9610a6076122085f71c41de5a711ed18679360d6b5972a47e6ee95371","last_reissued_at":"2026-05-18T02:05:50.049871Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:50.049871Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.1584","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:05:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Gt3RbtS6gm/7+ryFOT4CAPi16efLKG+xLut0UgmrhZTDzqYbjISzhT/c/XxRbhBbNoDIqT6GyPHQCzRzdgJkCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:07:41.062062Z"},"content_sha256":"5950dd48fa4e3d451f8b34f5b7522f3814720ce23ff0edbd49633edca4179edb","schema_version":"1.0","event_id":"sha256:5950dd48fa4e3d451f8b34f5b7522f3814720ce23ff0edbd49633edca4179edb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:RY2F3KLBBJQHMERAQX3RYQO6LJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the formation of single and binary helium-rich sdO stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Philipp Podsiadlowski, Stephen Justham, Zhanwen Han","submitted_at":"2010-08-09T20:03:53Z","abstract_excerpt":"We propose a formation channel for the previously unexplained helium-rich subdwarf O (He-rich sdO) stars in which post-subdwarf B (sdB) stars (i.e. hybrid COHe white dwarfs) reignite helium burning in a shell after gaining matter from their helium white-dwarf (WD) companions. Such short-period binaries containing post-sdB WDs and helium WDs are predicted by one of the major binary formation channels for sdB stars. In the majority of cases, mass transfer is expected to lead to a dynamically unstable merger event, leaving a single-star remnant. Calculations of the evolution of these stars show t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.1584","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:05:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XBJp3sq+TaEc+iUfs95YtqY5o2uGf5wUu4rhqOZbg/A7K7fX960lPwQKa6y/mIeyG3wc8on7AJvWJbiwiDx8CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:07:41.062671Z"},"content_sha256":"ad0fc93c5d973bd18b0a1b52f9c7b6fe854f1d294a03b938052eaada1a4c33ca","schema_version":"1.0","event_id":"sha256:ad0fc93c5d973bd18b0a1b52f9c7b6fe854f1d294a03b938052eaada1a4c33ca"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ/bundle.json","state_url":"https://pith.science/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-30T20:07:41Z","links":{"resolver":"https://pith.science/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ","bundle":"https://pith.science/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ/bundle.json","state":"https://pith.science/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RY2F3KLBBJQHMERAQX3RYQO6LJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:RY2F3KLBBJQHMERAQX3RYQO6LJ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"6e88540af94583377694ebdb84fbbe95d487530c19abb86024ef5388d370ba73","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-09T20:03:53Z","title_canon_sha256":"07d33c450484972e98825921ffe4048b3ccaf59c7e3aa3d330539b967a372b57"},"schema_version":"1.0","source":{"id":"1008.1584","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.1584","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"arxiv_version","alias_value":"1008.1584v1","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.1584","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"pith_short_12","alias_value":"RY2F3KLBBJQH","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"RY2F3KLBBJQHMERA","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"RY2F3KLB","created_at":"2026-05-18T12:26:13Z"}],"graph_snapshots":[{"event_id":"sha256:ad0fc93c5d973bd18b0a1b52f9c7b6fe854f1d294a03b938052eaada1a4c33ca","target":"graph","created_at":"2026-05-18T02:05:50Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We propose a formation channel for the previously unexplained helium-rich subdwarf O (He-rich sdO) stars in which post-subdwarf B (sdB) stars (i.e. hybrid COHe white dwarfs) reignite helium burning in a shell after gaining matter from their helium white-dwarf (WD) companions. Such short-period binaries containing post-sdB WDs and helium WDs are predicted by one of the major binary formation channels for sdB stars. In the majority of cases, mass transfer is expected to lead to a dynamically unstable merger event, leaving a single-star remnant. Calculations of the evolution of these stars show t","authors_text":"Philipp Podsiadlowski, Stephen Justham, Zhanwen Han","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-09T20:03:53Z","title":"On the formation of single and binary helium-rich sdO stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.1584","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:5950dd48fa4e3d451f8b34f5b7522f3814720ce23ff0edbd49633edca4179edb","target":"record","created_at":"2026-05-18T02:05:50Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"6e88540af94583377694ebdb84fbbe95d487530c19abb86024ef5388d370ba73","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-09T20:03:53Z","title_canon_sha256":"07d33c450484972e98825921ffe4048b3ccaf59c7e3aa3d330539b967a372b57"},"schema_version":"1.0","source":{"id":"1008.1584","kind":"arxiv","version":1}},"canonical_sha256":"8e345da9610a6076122085f71c41de5a711ed18679360d6b5972a47e6ee95371","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8e345da9610a6076122085f71c41de5a711ed18679360d6b5972a47e6ee95371","first_computed_at":"2026-05-18T02:05:50.049871Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:50.049871Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PUcsGGDhFWwq1Vl8i2vBMCoeeW6FIj3wChieZw+llVcDcI5xvWAzIPOqW3k/VRr693Coi/EgzG4beCBLdsw4BA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:50.050585Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.1584","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5950dd48fa4e3d451f8b34f5b7522f3814720ce23ff0edbd49633edca4179edb","sha256:ad0fc93c5d973bd18b0a1b52f9c7b6fe854f1d294a03b938052eaada1a4c33ca"],"state_sha256":"04b387a0f30cafcc36c1668acc467f23a2022436ce9c62b2acf441c89ce39504"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ur1ZuQiRNB0hMyzMUDBUJTALDA25F3CAJ5v23yuLWmNIjsuUZbjOdECpbXj55fYuzhax8T8A7GWSXsLekSUpAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T20:07:41.065844Z","bundle_sha256":"d2aab4ce00a0a0503e36f4d5d73dfd7baf42e094b06ab8778042a916105b5c97"}}